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<chapter>
<title>Installation</title>
<sect1>
<title>Prerequisites</title>
<para>
Nix uses Sleepycat's Berkeley DB and CWI's ATerm library. However, these
are fetched automatically as part of the build process.
</para>
<para>
Other than that, you need a good C++ compiler. GCC 2.95 does not appear
to work; please use GCC 3.x.
</para>
</sect1>
<sect1>
<title>Obtaining Nix</title>
<para>
Nix can be obtained from its <ulink
url='http://losser.st-lab.cs.uu.nl:12080/repos/trace/nix/trunk'>Subversion
repository</ulink>. For example, the following command will check out
the latest revision into a directory called <filename>nix</filename>:
</para>
<screen>
$ svn checkout http://losser.st-lab.cs.uu.nl:12080/repos/trace/nix/trunk nix</screen>
<para>
Likewise, specific releases can be obtained from the <ulink
url='http://losser.st-lab.cs.uu.nl:12080/repos/trace/nix/tags'>tags
directory</ulink> of the repository. If you don't have Subversion, you
can download a <ulink
url='http://losser.st-lab.cs.uu.nl:12080/dist/trace/'>compressed
tar-file</ulink> of the latest revision of the repository.
</para>
</sect1>
<sect1>
<title>Building Nix</title>
<para>
To build Nix, do the following:
</para>
<screen>
$ autoreconf -i
$ ./configure <replaceable>options...</replaceable>
$ make
$ make install</screen>
<para>
Currently, the only useful switch for <command>configure</command> is
<option>--prefix=<replaceable>prefix</replaceable></option> to specify
where Nix is to be installed. The default installation directory is
<filename>/nix</filename>. You can change this to any location you like.
You should ensure that you have write permission to the installation
prefix.
</para>
<warning>
<para>
It is advisable <emphasis>not</emphasis> to change the installation
prefix, since doing so will in all likelihood make it impossible to use
derivates built on other systems.
</para>
</warning>
</sect1>
</chapter>
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